You know what they say – diamonds are a girl’s best friend. Well, there are some things about your best friend that even you probably don’t know, and diamonds are no exception. Giving someone a piece of diamond jewelry is one of the best ways to show them just how much you care, but choosing the best diamond isn’t easy if you don’t know all the facts. With the most esteemed piece of jewelry in mind, here we present our list of 10 things you didn’t know about diamonds.

Number Ten: They’re the hardest Substance in the World

Diamonds are harder than any other natural substance on earth. In fact, the name “diamond” stems from the Greek word “adamas,” which literally means “unconquerable and indestructible.”

Number Nine: Most of Them Are Billions of Years Old

That stone on your ring might look sparkly and new, but it’s probably far from it. The truth is that most diamonds are between one and three billion years old, and the oldest ones have been around since the earth’s very beginning.

Number Eight: One Carat Requires 250 Tons of Soil

In order to mine and produce just one carat of diamonds, up to 250 tons of ground must be moved in the process. Very rarely do diamonds appear on the earth’s surface, although they have been shown to do so in parts of Arkansas in the United States.

Number Seven: When it Comes to Diamonds, Size Doesn’t Matter

Many people are impressed by large rocks, but size doesn’t always matter with diamonds. For example, one two-carat diamond is much more valuable than two single-carat diamonds, despite the fact that they are technically the same size.

Number Six: They Were Once Considered Magical

In fact, they used to be used in ancient wars! Rich kings would wear them going into battle because they believed the diamond carried magical powers to protect them while they fight.

Number Five: The Word ‘Carat’ Comes From a Tree

You probably know that the word “carat” doesn’t come from the vegetable, but what you might not know is that it comes from a tree! The seeds of the carob tree used to be used to measure precious stones, and so the word “carat” comes from the name of the tree.

Number Four: They Can Only Be Polished With Powder From Another Diamond

It’s true! Diamonds can only be polished with diamond powder. Similarly, they can only be cut with another diamond or something made from a diamond.

Number Three: They’re Not Really That Rare

Diamond jewelry might be expensive, but diamonds themselves are not rare. People are willing to spend lots of money on diamond jewelry because of its connotation with engagement and the labor involved to make the jewelry.

Number Two: 80 Percent of Them Are Used for Industrial Purposes

Though you might think that all of those gorgeous gems go straight to Tiffany’s, in reality, 80 percent of all mined diamonds end up being used for industrial purposes. These purposes include cutting, drilling, polishing, and grinding.

Number One: They Glow in the Dark

Whether you’re a diamond lover or not, there’s no denying that this is really cool. Some jewelers shine ultraviolet light on a diamond to determine whether or not it’s real; a real diamond will glow when ultraviolet light is shined on it. We hope you enjoyed our list! Click here to check out more interesting information about diamonds.